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Summary of Significant Accounting Policies (Narrative) (Details) R$ in Thousands, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2017 | May 15, 2017 | Dec. 31, 2011 | Apr. 30, 2017 | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 BRL (R$) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2016 shares | Jan. 01, 2019 USD ($) | May 16, 2017
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  | $ 22,786 |  | $ 21,490 | $ 19,998 |  |  |  |  |  |  |
Less: Net loss attributable to noncontrolling interest |  |  |  |  | $ (100) | $ (30) |  |  | (130) | (1,887) |  |  |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized |  |  |  |  |  |  | 6,875 |  | 9,260 |  |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 62,032 |  | 75,243 |  |  |  |  |  |  |  |
Amortization |  |  |  |  |  |  | 6,406 |  | 6,440 | 3,259 |  |  |  |  |  |  |
Amortization expense next year |  |  |  |  |  |  | 6,205 |  |  |  |  |  |  |  |  |  |
Amortization expense year two |  |  |  |  |  |  | 6,205 |  |  |  |  |  |  |  |  |  |
Amortization expense year three |  |  |  |  |  |  | 6,205 |  |  |  |  |  |  |  |  |  |
Amortization expense year four |  |  |  |  |  |  | 6,205 |  |  |  |  |  |  |  |  |  |
Amortization expense year five |  |  |  |  |  |  | $ 6,205 |  |  |  |  |  |  |  |  |  |
Intangible assets, weighted-average remaining amortization period, years |  |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |
Intangible impairment charge |  |  |  |  |  |  | $ 202 |  |  |  |  |  |  |  |  |  |
Design and development expense |  |  |  |  |  |  | $ 51,074 |  | $ 48,877 | $ 40,212 |  |  |  |  |  |  |
Design and development expense percentage |  |  |  |  |  |  | 5.90% | 5.90% | 5.90% | 5.80% |  |  |  |  |  |  |
Research and development expense reimbursed |  |  |  |  |  |  | $ 16,540 |  | $ 14,946 | $ 12,764 |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | 5,632 |  | 7,265 | 6,134 |  |  |  |  |  |  |
Share-based compensation expense capitalized as inventory |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  |  |  |
Cumulative goodwill impairment |  |  |  |  |  |  | 300,083 |  | 300,083 |  |  |  |  |  |  |  |
Product warranty and recall accrual |  |  |  |  |  |  | 3,283 |  | 3,112 |  |  |  |  |  |  |  |
Inventory amount, FIFO |  |  |  |  |  |  | 64,745 |  | 54,837 |  |  |  |  |  |  |  |
Inventory amount, weighted average cost |  |  |  |  |  |  | 14,533 |  | 18,634 |  |  |  |  |  |  |  |
Foreign currency transaction gain (loss) |  |  |  |  |  |  | 487 |  | (500) | 268 |  |  |  |  |  |  |
Amortization of financing costs |  |  |  |  |  |  | 326 |  | 324 | 355 |  |  |  |  |  |  |
Deferred financing costs, net |  |  |  |  |  |  | 882 |  | 1,208 |  |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | 5,632 |  | 7,265 | 6,134 |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] | CEO Retirement Additional Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional stock compensation expense in connection with retirement of former President and CEO |  |  |  |  |  |  |  |  |  | $ 545 |  |  |  |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized |  |  |  |  |  |  | 6,875 |  | 8,894 |  |  |  |  |  |  |  |
Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  |  |  |  |  |  | 33,628 |  |  |  |  |  |  |  |
Intangible impairment charge |  |  |  |  |  |  | 202 |  |  |  |  |  |  |  |  |  |
PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable sold |  |  |  |  |  |  | $ 0 | R$ 7,983 | 2,520 |  |  |  |  |  |  |  |
Gain (loss) on sale of accounts receivable |  |  |  |  |  |  |  | 273 | (86) |  |  |  |  |  |  |  |
Proceeds from sale of accounts receivable |  |  |  |  |  |  |  | R$ 7,710 | $ 2,434 |  |  |  |  |  |  |  |
Performance Based Restricted Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, non-vested | shares |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  | 0 |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | shares |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  | 0 |  |
Performance Based Right to Receive Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, non-vested | shares |  |  |  |  |  |  | 628,220 |  | 766,538 | 843,140 |  |  |  |  | 843,140 |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | shares |  |  |  |  |  |  | 628,220 |  | 766,538 | 843,140 |  |  |  |  | 843,140 |  |
Customer Lists [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | $ 37,651 |  | $ 44,977 |  |  |  |  |  |  |  |
Customer Lists [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 25,501 |  |  |  |  |  |  |  |  |  |
Customer Lists [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 12,150 |  |  |  |  |  |  |  |  |  |
Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 14,805 |  | 17,900 |  |  |  |  |  |  |  |
Trade Names [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 4,939 |  |  |  |  |  |  |  |  |  |
Trade Names [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 9,866 |  |  |  |  |  |  |  |  |  |
Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 9,576 |  | 12,366 |  |  |  |  |  |  |  |
Technology [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | 4,566 |  |  |  |  |  |  |  |  |  |
Technology [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  | $ 5,010 |  |  |  |  |  |  |  |  |  |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary | 74.00% | 74.00% | 74.00% | 74.00% |  | 74.00% |  |  |  | 74.00% | 74.00% | 74.00% | 74.00% | 74.00% | 74.00% |  |
Percentage of additional noncontrolling interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.00%
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | $ 130 | $ 1,887 |  |  |  |  |  |  |
MSIL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 49.00% |  | 49.00% | 49.00% |  |  |  |  | 49.00% |  |
Equity method investments |  |  |  |  |  |  | $ 11,288 |  | $ 10,131 |  |  |  |  |  |  |  |
Maximum [Member] | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,200 |
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,200 |
Maximum [Member] | Pre-production Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Minimum [Member] | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,600 |
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,600 |
Minimum [Member] | Pre-production Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |

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